Monotron
莫诺速调管, 直越式速调管, 无反射极速调管
🗣️ 情景例句
Reading childern's literature is an excellent way for the beginning English speaker to improve.
对于刚刚开始学说英语的人，阅读儿童文学读物是个不错的方法。
One thorn of experience is worth a whole wilderness of warning.
一次痛苦的经验抵得上千百次的告诫。
I was standing at the back, so I couldn't see very well.
我站在后面，看不清。